Crown Boiler ODV-125 - Manual (Page 23)

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6) Start the boiler. Immediately take a smoke. If any smoke is present, open the air adjustment to
obtain a zero smoke.
7) Allow boiler to warm up for about 15 minutes or until the binder has completely burned out of
the combustion chamber. Adjust the air to obtain a CO2 between 11.0% and 12.5% with a zero
smoke. If a zero smoke cannot be obtained in this range of CO2s, see “Service Notes” on
page 18.
8) Cycle the boiler several times to make sure that the light-offs are smooth and reliable.
9) Allow the boiler to fire until the water temperature reaches the high limit setting. Confirm that
the high limit shuts down the burner.
10) Confirm that the thermostat/s cycle the burner and the appropriate circulator/s and/or zone
valves.
11) Recheck the piping for leaks. Repair any leaks found at once.
12) Inspect the vent system for flue gas leaks. Repair any leaks found before leaving the boiler in
operation.
X Service Notes
1) The pressure switch on the ODV is designed to protect the boiler against blockages in the vent
or intake piping. The electrical contacts on this switch are connected to “T-T” on the burner’s
primary control and are normally closed. This pressure switch is equipped with an orifice on the
negative pressure side of so that the blockage must be present for several seconds before the
switch shuts down the burner.
In the event that a blockage appears in either side of the vent/ intake piping, the pressure switch
will open the burner after a delay of 10 –60seconds. The burner will go into post purge and
then shut down. After a delay of approximately 4 seconds it will go into pre-purge. If the block-
age is still present, the burner will cycle in and out of pre-purge at intervals of approximately 20
seconds until the blockage is removed or power to the burner is interrupted.
Each size ODV boiler has a different pressure switch setting:
Model Switch Contacts Open on Pressure Rise
ODV-75 0.23 +/- 0.025” w.c.
ODV-100 0.305 +/- 0.025” w.c.
ODV-125 0.45 +/- 0.025 “ w.c.
Route the 1/8 silicone tubing shipped wrapped over the intake collar along the left side of the
jacket to the hose barb on the 7 x 4 adapter. Use the cable clamps provided to attach this hose to
the left side jacket panel. Figure 23 shows the pressure switch tubing connections.
NOTE
The ODV boiler is equipped with a ceramic combustion chamber. On initial start-up,
the binder on this chamber will burn out, possibly resulting in a yellow spot on smoke
paper. This binder should burn out in approximately 30 minutes of operation and
should not reappear. Successive smoke readings taken over this 30-minute “burn-out”
period should result in decreasing amounts of yellow on each smoke spot.